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Aging, exercise, and extracellular matrix in the heart.

Hyo-Bum Kwak1

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Aging impairs heart structure and function, increasing fibrosis. Exercise training can protect the aging heart by modulating extracellular matrix (ECM) regulators, including matrix metalloproteinases (MMPs) and tissue inhibitors of metalloproteinases (TIMPs).

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Area of Science:

  • Cardiovascular physiology
  • Aging research
  • Exercise science

Background:

  • Aging leads to cardiac structural and functional decline, characterized by fibrosis and impaired extracellular matrix (ECM) remodeling.
  • Fibrosis, or collagen accumulation, in the aging heart increases myocardial stiffness and impairs cardiac function.
  • Understanding ECM regulators like matrix metalloproteinases (MMPs), tissue inhibitors of metalloproteinases (TIMPs), and transforming growth factor-β (TGF-β) is crucial for managing age-related cardiac dysfunction.

Purpose of the Study:

  • To review the effects of aging and exercise on cardiac fibrosis and ECM regulation.
  • To discuss how exercise training may attenuate age-associated cardiac remodeling.
  • To highlight the role of upstream ECM regulatory factors in the aging heart.

Main Methods:

  • Review of existing literature on aging, cardiac fibrosis, ECM remodeling, and exercise training.
  • Analysis of recent findings on the impact of 12 weeks of exercise training on cardiac ECM in aging hearts.
  • Examination of changes in MMPs, TIMPs, and TGF-β in response to exercise.

Main Results:

  • Exercise training improved cardiac function and protected against collagen ECM geometric changes in aging hearts.
  • Exercise training ameliorated age-associated ECM dysregulation.
  • Key findings include up-regulation of active MMPs and down-regulation of TIMPs and TGF-β with exercise.

Conclusions:

  • Exercise training offers protective benefits against age-related cardiac fibrosis and ECM remodeling.
  • Modulation of ECM regulatory factors by exercise presents a potential therapeutic strategy for aging hearts.
  • Further research into exercise's effects on cardiac ECM is warranted to combat age-associated heart dysfunction.